Question

Select One Option Correct from the following : A tiny spherical oil drop carrying net charge q is balanced in still air with a vertical uniform electric field of strength $\frac{81 \pi}{7} \times V/m$ When the field is switched off, the drop is observed to fall with terminal velocity $2 \times 10^{-3} m/s$ Given $g = 9.8 m/s^2$, viscosity of the air =$1.8 \times 10^{-5} N. s/m^2$ and the density of oil = $900 kg/m^3$ the magnitude of q is
(A) $1.6 \times 10^{-19} C$
(B) $3.2 \times 10^{-19} C$
(C) $4.8 \times 10^{-19} C$
(D) $8.0 \times 10^{-19} C$

Answer 1

Answer:

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Explanation: